Originally Posted by CrazyChester
To add to "how you can tell": I know that my mare and another in the barn both call (whinny at the top of their lungs!!) to the other horses in the barn CONSTANTLY when they're going into heat...even when we're riding them sometimes!
That was the big sign today...she was just calling and calling in her stall and would not stop, it was almost embarassing, she was disrupting the whole barn and others were trying to ride and hold conversations and here's Sandie screaming her head off at the geldings lol!!
Oh that and any geldings anywhere near her will stick up their top lip, it looks hilarious, it's called the "flehmen response" (Flehmen response - Wikipedia, the free encyclopedia
Those 2 things are the tell tale signs for Sandie and a few other mare-owners I know!